Configuration Management with Puppet

Configuration Management
with Puppet
Rachel Andrew, Future Insights Live! 2015
Photo credit: https://www.ﬂickr.com/photos/andreakirkby/5450450019

@rachelandrew | Read more at http://rachelandrew.co.uk/presentations/puppet-developers
Rachel Andrew
http://rachelandrew.co.uk
@rachelandrew
http://grabaperch.com

Many issues coming into support stem from
poor development and deployment processes.

The Big Problems
• Developing directly on live sites or in subfolders of live sites
• Developing in subfolders locally
• Setting up local development environments that are so
different to the eventual live server that there is no
confidence when going live
• Working in teams where everyone has a slightly different
setup

Improving workflow is the best way to give
yourself more hours in the day.

Today we’re going to take a look at
• A really simple way to get started with Vagrant and Puppet
for those of you who haven’t used these tools before.
• Vagrant and Puppet fundamentals, how to start writing your
own manifests.
• How you can take this knowledge into production, even if you
manage just one or two servers.

First Steps

We need …
• to develop multiple websites on our own computer.
• to know that our live server and local server support the
same things.
• to deploy our site and have confidence that what is on the live
server is identical to our local version.
• to have everyone who works on a site using the same
development environment so we aren’t creating problems for
each other.

Q. How do you develop sites locally that require a
web server?
A. MAMP, WAMP, XAMPP or similar
63%

In an ideal world your local development
environment is identical to the live server.

http://php.net/manual/en/function.strftime.php

PHP Versions can be different. PHP modules
may not be available on the live server.

Virtual Machines

virtualbox.org

vagrantup.com

https://puphpet.com

http://rachelandrew.co.uk/presentations/deploy/puphpet

Upload a PHP file with
this function to find out
what is available on your
live server.
<?php phpinfo();?>

Things to check on your live server
• PHP Version
• Installed modules such as gd for image processing
• post_max_size and upload_max_filesize determine the size
of files that can be uploaded
• max_input_vars is the number of form fields allowed in a
post

Shared Folders

Basic commands for
Vagrant.
// start the VM
> vagrant up
// shut down the VM
> vagrant halt
//destroy the VM
> vagrant destroy
//ssh access
> vagrant ssh

http://vagrantmanager.com/

Share your package with anyone else working
on the site. The whole team can then have the
exact same development setup.

Using PuPHPet should get you up and running
in a few hours. This will pay dividends in time
saved in the long run.

Getting Under the Hood

https://github.com/PerchCMS/perch-vagrant

In the Vagrantfile we tell
Vagrant we will be
provisioning with Puppet.
# Enable the Puppet provisioner, point it to
our files
config.vm.provision :puppet do |puppet|
puppet.manifests_path = "puppet/manifests"
puppet.manifest_file = "site.pp"
puppet.module_path = "puppet/modules"
puppet.hiera_config_path = "puppet/hiera.yaml"
end

What is Puppet?
• A Configuration Management solution
• Allows you to define in code the state of a server including
• Packages that should be installed
• Services that should be running
• Files and folders
• Permissions
• Cron jobs

You could set up a VM and
then install everything by
hand using the package
manager for your
distribution.
> sudo apt-get install apache2
> sudo apt-get install mysql-server
> sudo apt-get install php5 php5-mysql

Puppet Terminology
• Manifest: a file that contains Puppet code
• Resource: a thing that needs configuring, Apache is a
resource, and so is a virtual-host. Resources have types - for
example file, package, cron.
• Module: a collection of manifests, templates and other files
organised around a particular purpose.

Inside the Apache module
is a manifests folder. This
contains the manifests:
- init.pp
- vhost.pp puppet
modules
apache
manifests
- init.pp
- vhost.pp
templates
- vhost-default-conf.erb

All modules need an
init.pp manifest. It is used
when the module is
included.
In the apache init.pp
- install the apache
package
- make sure apache is
running
- install the rewrite
module
class apache {
package { "apache2":
ensure => present,
}
service { "apache2":
ensure => running,
require => Package["apache2"],
}
file { "/etc/apache2/mods-enabled/rewrite.load":
ensure => link,
target => "/etc/apache2/mods-available/rewrite.load",
require => Package["apache2"]
}
}

http://garylarizza.com/blog/2014/10/19/on-dependencies-and-order/
On dependencies and order - why Puppet
doesn’t care about execution order (until it
does).

The manifest file vhost.pp
sets up a VirtualHost by
creating a file in sites-
available and symlinking it
into sites-enabled.
We notify the apache2
service, which will then
reload to pick up the new
config.
define apache::vhost(
$vhost_docroot = false,
$vhost_name = false,
$vhost_options =['Indexes','FollowSymLinks','MultiViews'],
) {
file {"/etc/apache2/sites-available/${vhost_name}":
content => template("apache/vhost-default.conf.erb"),
owner => 'root',
group => 'root',
mode => '755',
require => Package['apache2'],
notify => Service['apache2'];
"/etc/apache2/sites-enabled/${vhost_name}":
ensure => link,
target => "/etc/apache2/sites-available/${vhost_name}",
notify => Service['apache2'];
}
}

The template file for a
VirtualHost includes
variables which will be
replaced out by the
details for each host.
# ************************************
# Default template for vhosts
# Managed by Puppet
# ************************************
<VirtualHost *:80>
ServerName <%= @vhost_name %>
DocumentRoot <%= @vhost_docroot %>
<Directory <%= @vhost_docroot %>>
Options <%= @vhost_options %>
AllowOverride All
Order allow,deny
allow from all
</Directory>
ErrorLog /var/log/apache2/<%= @vhost_name %>_error.log
LogLevel warn
CustomLog /var/log/apache2/<%= @vhost_name %>_access.log
combined
ServerSignature Off
</VirtualHost>

The site.pp file is special
and kicks off the whole
process.
In my case it includes the
modules we want to run.
stage { 'setup':
before => Stage['main']
}
class { 'base':
stage => 'setup'
}
include base, apache, mysql, php,
bootstrap

The Hiera config file
defines a YAML backend
and gives the location of
the configuration data.
In my project that is in the
manifest directory, in a
folder named hiera.
---
:backends: yaml
:yaml:
:datadir: "%{settings::manifestdir}/
hiera"
:hierarchy:
- "%{::clientcert}"
- "%{::environment}"
- config
:logger: console

In my YAML file I have
added a setting for
mysql_root_password.
File:  
manifests/hiera/config.yaml
mysql_root_password: 'vagrant'

I set the parameter
$root_pw with the value
using a hiera() function.
I can then use $root_pw
within the manifests.
File:  
modules/mysql/manifests/
init.pp
class mysql(
$root_pw = hiera('mysql_root_password'),
) {
package { "mysql-server":
ensure => present,
}
service { "mysql":
enable => true,
ensure => running,
require => Package["mysql-server"],
}
exec { "set-mysql-password":
unless => "/usr/bin/mysqladmin -uroot -p$root_pw status",
command => "/usr/bin/mysqladmin -uroot password $root_pw",
require => Service["mysql"],
}
}

In my YAML file I have a
list of PHP Modules.
File:  
manifests/hiera/config.yaml
php_modules:
- "php5"
- "php5-cli"
- "php5-mysql"
- "php5-gd"
- "php5-imagick"
- "php5-curl"
- "libapache2-mod-php5"

I get the php_modules
with the hiera function
and then pass the list to
the package resource
type.
File:  
modules/php/manifests/
init.pp
class php(
$packages = hiera('php_modules'),
$php_upload_max_filesize = hiera('php_upload_max_filesize'),
$php_max_file_uploads = hiera('php_max_file_uploads'),
$php_memory_limit = hiera('php_memory_limit'),
$php_error_reporting = hiera('php_error_reporting'),
$php_post_max_size = hiera('php_post_max_size'),
) {
package { $packages:
ensure => present,
}
file {'/etc/php5/apache2/php.ini':
ensure => file,
content => template("php/php.ini.erb"),
notify => Service["apache2"],
require => Package["php5"],
}
}

In my YAML file I have
configures two sites.
apache_vhosts:
site1:
vhost_docroot: '/var/www/test_site1'
vhost_name: 'site1.dev'
vhost_options: 'All'
site2:
vhost_docroot: '/var/www/test_site2'
vhost_name: 'site2.dev'
vhost_options: 'All'

Use the hiera_hash
function to get my site
information and pass it to
create_resources.
The create_resources
function then calls my
host manifest with that
hash as the data.
class bootstrap {
# Make sure everything is installed
$sites = hiera_hash('apache_vhosts')
create_resources('apache::vhost',$sites)
$databases = hiera_hash('mysql_db')
create_resources('mysql::db',$databases)
}

This is the manifest that
creates the databases I
need. define mysql::db(
$db_name = false,
$db_user = false,
$db_password = false,
$root_pw = hiera('mysql_root_password'),
) {
exec { "create-${db_name}":
unless => "/usr/bin/mysql -u${db_user} -p$
{db_password} ${db_name}",
command => "/usr/bin/mysql -uroot -p$
{root_pw} -e "create database ${db_name}; grant
all on ${db_name}.* to ${db_user}@localhost
identified by '$db_password';"",
require => Exec["set-mysql-password"],
}
}

To set up a new VM
• git clone
• edit the Vagrantfile for IP address, project name
• edit the config.yaml to create sites and databases
• vagrant up

Your entire development environment
can now be described in text files.

Share your environment with your
team - they just edit the config.yaml.

Provisioning files and data

The challenge
• Take latest files and database dump from Github
• Deploy the three sites with the current Perch version and
add-ons
• Run the upgrade and change any templates as needed
• Produce the db dump with placeholders for Github and a Ruby
db template with placeholders for the demo server
• Produce zipped archives for use by the demo server

https://forge.puppetlabs.com/puppetlabs/vcsrepo

Using the Puppetlabs
vcsrepo module to clone a
repository.
vcsrepo { '/path/to/repo':
ensure => present,
provider => git,
source => 'git://example.com/repo.git',
}

The YAML definition for
one of our three demos. It
includes the Git repo,
local path, database
details and Perch license
key.
I also detail the Perch
Add-ons that need to be
installed along with Perch
Core.
demo2:
repo_uri: 'https://github.com/PerchCMS/
perchdemo-swift'
vhost_path: '/var/www/perchdemos/demo-swift'
db_name: 'db_demo_swift'
db_user: 'vagrant'
db_password: 'vagrant'
key: ‘xxxx-xxxx-xxxx-xxxx‘
sql_path: '/sql/swift_demo.sql'
install_addons:
demo2_blog:
addon_name: 'perch_blog'
addon_type: 'apps'
demo2_forms:
addon_name: 'perch_forms'
addon_type: 'apps'
demo2_questions:
addon_name: 'perch_questions'
addon_type: 'apps'

I deploy my databases
and sites but also set off
a build of the demos.
class bootstrap {
$databases = hiera_hash('mysql_db')
create_resources(‘mysql::db',$databases)
$demos = hiera_hash('demo_deploy')
create_resources(‘perchdemo::deploy',$demos)
$sites = hiera_hash('apache_vhosts')
create_resources('apache::vhost',$sites)
}

In deploy.pp we get the
files from git, each site
has a database dump
which I do some string
replacement on - then
import it.
vcsrepo { "${vhost_path}":
ensure => present,
provider => git,
source => $repo_uri,
}
exec { "replace-${db_name}":
command => "/bin/sed -i 's/{firstname}/REPLACE_firstname/
g' ${vhost_path}${sql_path} ; /bin/sed -i 's/{lastname}/
REPLACE_lastname/g' ${vhost_path}${sql_path} ; /bin/sed -i
's/{email}/REPLACE_hello@grabaperch.com/g' ${vhost_path}$
{sql_path} ; /bin/sed -i 's/{username}/REPLACE_username/g'
${vhost_path}${sql_path} ; /bin/sed -i 's/{password}/
5f4dcc3b5aa765d61d8327deb882cf99/g' ${vhost_path}$
{sql_path}",
}
exec { "import-${db_name}":
command => "/usr/bin/mysql -uroot -p${root_pw} $
{db_name} < ${vhost_path}${sql_path}",
}

Up to date Perch Core
and add-ons are in a local
file store.
I use a Ruby .erb template
for the Perch Config so I
can add the database
details and license key.
I use create_resources to
add the add-ons specified
in the YAML for this site.
file { "${vhost_path}/public_html/perch/core":
ensure => present,
source => "${file_store}/core",
recurse => true,
}
file { "${vhost_path}/public_html/perch/config/
config.private.php":
ensure => present,
content => template('perchdemo/config.private.php.erb'),
}
create_resources('perchdemo::copy_addons',$install_addons,
{'vhost_path'=>$vhost_path,'file_store'=>$file_store})

At the command line you
can run puppet apply to
run a manifest.
In this case I am running
builder.pp which builds
me an archive to upload
for each site. > puppet apply --modulepath=/vagrant/
puppet/modules --hiera_config /vagrant/
puppet/hiera.yaml -e "include
perchdemo::builder"

Taking Puppet to Production

Puppet Masters

Masterless Puppet

You don’t have to provision the entire server
using Puppet. Start with small tasks.

Use Puppet to create user accounts with the correct
privileges and ssh keys on each server you set up.

Use an inexpensive VPS for client staging
sites. Manage the VirtualHosts using Puppet.

https://forge.puppetlabs.com/puppetlabs/apache

Schedule regular Puppet runs to check that
services are running, and restart them if not

Puppet can ensure files and directories exist
and they have the correct permissions set

Using Puppet can allow people to edit
configs without needing privileges on
production servers.

Configuration can be edited, checked into Git
and reviewed before being deployed.

Modules you use on the server can
often be also used in development.
Ensuring the same environment.

Change one small thing.

Improve one thing about your
workflow. Build from there.

Thank you FILIVE!
Rachel Andrew
http://rachelandrew.co.uk/presentations/puppet-developers
me@rachelandrew.co.uk
@rachelandrew

Configuration Management with Puppet

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